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The largest prime factor of 123456. Note that 643(64*3) = 123456. [De Montagu]
643 millimetres is the record monthly rainfall in Sydney (from June 1950). 643 = (3^{8} + 8^{3})/(3 + 8). [Trotter] There is a 643 double play in baseball. [Patterson] According to "The New Book of Prime Number Records," the product of the first 643 primes plus one is prime. This integer consists of 2038 digits and is known in MATHEMATICA as Euclid [643]. Also note that 643 is a prime. [Schiffman] The smallest zero in "Cald's Sequence" occurs at the prime number 643. [Brockhaus] If A=2, B=3, C=5, D=7, ... , Z=101, then 'A TWIN PRIME NUMBER' is a twin prime number. [Homewood]
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